Question

using the identity a²-b²=(a+b)(a-b) find the product of (xy-x)(xy+x)​

Answer 1

$(xy - x)(xy + x) \\ = (xy) {}^{2} - (x) {}^{2} \\ = {x}^{2} {y}^{2} - {x}^{2} \\ = {x}^{2} ( {y}^{2} - 1)$